An uncoiling device and uncoiling method for a zinc-coated steel coil

Abstract

The patent application discloses a kind of uncoiler for galvanized steel coil and uncoiling method, including base, support structure, anti-loosening component and extrusion mechanism.The anti-loosening component includes roller, guide block and pressurizing structure, and the pressurizing structure is used to adjust the size of extrusion force when roller limits galvanized steel coil;Support structure includes base, adjusting mandrel and first drive motor.Adjusting mandrel includes abutment plate, center shaft, air cylinder, bellows, air pipe and vacuum pump;Air cylinder is arranged on center shaft, and the movable end of air cylinder is connected with abutment plate.In the patent application, abutment plate is arranged on support structure, and buffer layer is arranged on abutment plate, and the air between buffer layer and inner wall of galvanized steel coil is sucked out by vacuum pump, and the suction force generated by negative pressure can prevent the inner ring of galvanized steel coil from loosening, and the galvanized steel coil is fixed by the suction force generated by negative pressure, which will not cause wear to the galvanized steel coil, and avoid damage to the galvanized steel coil during uncoiling process.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of steel coil production and processing equipment, and particularly relates to a decoiling device and decoiling method for galvanized steel coils. BACKGROUND

[0002] A galvanized steel coil is a kind of steel coil that has been specially treated with a thick layer of zinc on its surface, giving it a silvery white luster. The galvanizing process is a process in which steel is immersed in molten zinc to form a zinc layer on the surface of the steel. This process can enhance the corrosion resistance and service life of the steel, and is therefore widely used in the fields of construction, automobiles, home appliances, and machinery manufacturing, for the manufacture of various components, parts, and structural parts.

[0003] Before processing, the galvanized steel coil needs to be decoiled using a decoiler. The decoiler is a preliminary uncoiling device for metal plates during leveling. In the utility model patent with the publication number CN215998141U (hereinafter referred to as "Prior Art 1"), a decoiler for steel coils is disclosed. Prior Art 1 uses a first hydraulic cylinder as a power source to pull the movable anti-loose rod, causing the movable roller at the top of the anti-loose rod to come into contact with the steel coil, thereby limiting and fixing the steel coil to ensure its stability during processing and prevent it from becoming loose.

[0004] Prior Art 1 does not have a protection device for the steel coil during the decoiling process. Any action that may cause damage to the coil should be strictly prohibited during the decoiling process, such as irreversible damage to the surface of the coil, scratching, etc. In particular, when handling galvanized steel coils, such damage may cause irreparable damage to the galvanized layer on the surface of the steel coil. When the galvanized layer is damaged, the exposed steel cannot resist the corrosion of air, moisture, and other chemicals, which will cause the steel to rust gradually. After the steel rusts, its corrosion resistance and service life will be severely affected.

[0005] Invention patent content

[0006] The present invention provides a decoiling device and method for galvanized steel coils to solve the problem of irreversible damage to the coil during the decoiling process, which leads to a decrease in the service life and corrosion resistance of the coil.

[0007] The technical solution of the present invention is as follows:

[0008] The utility model provides a kind of uncoiler for galvanized steel coil, including base, support structure, anti-loose component and extrusion mechanism, support structure is arranged on base, support structure is slidably connected with base, support structure is used to be fixed to galvanized steel coil, anti-loose component is connected with support structure, anti-loose component is used to limit steel coil to prevent galvanized steel coil become loose with the increase of unfolding amount, extrusion mechanism is arranged in one side of support structure, extrusion mechanism is used to flatten galvanized steel coil, lifting device is arranged below base, the movable end of lifting device is connected with base.

[0009] Anti-loose component includes roller, guide block and pressurizing structure, guide block is provided with sliding slot, the end of roller is provided with square, square is slidably connected with sliding slot, roller is rotatably connected with square, pressurizing structure is arranged in guide block, and pressurizing structure is used to adjust the size of extrusion force when roller limits galvanized steel coil;Support structure includes base, adjusting arbor and first drive motor, adjusting arbor is rotatably connected with base, and first drive motor is used to drive adjusting arbor to rotate.

[0010] Adjusting arbor includes abutment plate, central shaft, air cylinder, bellows, air pipe and vacuum pump;Air cylinder is arranged on central shaft, and the movable end of air cylinder is connected with abutment plate;Central shaft is provided with air hole, one end of air pipe is connected with vacuum pump, and the other end of air pipe is rotatably connected with air hole;Cavity is arranged in abutment plate, and bellows is communicated with air hole and air hole;Buffer layer is arranged on abutment plate, and air hole is arranged on abutment plate, and air hole is communicated with cavity and outside.

[0011] In a preferred technical solution, the extrusion mechanism includes a bracket, an upper flattening roller, and a lower flattening roller. The bracket is provided with an adjusting slot. The end of the upper flattening roller is slidably connected with the adjusting slot. The end of the lower flattening roller is slidably connected with the adjusting slot.

[0012] In a preferred technical solution, the upper flattening roller and the lower flattening roller are provided with a non-slip layer.

[0013] In a preferred technical solution, the extrusion mechanism is provided with a cleaning device on one side. The cleaning device includes a square shell and a sponge pad. The sponge pad is arranged in the square shell and is used to clean the surface of the galvanized steel coil.

[0014] In a preferred technical solution, the square shell is provided with a liquid storage tank. The liquid storage tank is provided with cleaning liquid. The square shell is provided with a liquid outlet pipe. The square shell is provided with a liquid inlet hole. The liquid outlet pipe is in communication with the liquid inlet hole.

[0015] In a preferred technical solution, the anti-loose component is provided with a limiting plate. The limiting plate is provided with a moving slot. The roller is provided with a threaded hole. The limiting plate is connected with the roller through a bolt. The bolt is threadedly connected with the threaded hole through the moving slot.

[0016] In a preferred technical solution, a smooth coating is arranged on the limiting plate.

[0017] In a preferred technical solution, a protective layer is arranged on the roller.

[0018] A method for uncoiling a galvanized steel coil comprises the following steps:

[0019] First, the distance between the rollers of the anti-loosening assembly is adjusted to the maximum, and then the staff manually moves the galvanized steel coil in front of the support structure, adjusts the center line of the support structure to the same horizontal plane as the axis of the galvanized steel coil by controlling the lifting device;

[0020] The position of the support structure is adjusted and the cylinder is controlled to make the buffer layer of the abutting plate contact the inner wall of the galvanized steel coil, and then the vacuum pump is started to suck out the air between the buffer layer and the inner wall of the galvanized steel coil, so that the inner wall of the galvanized steel coil is in close contact with the buffer layer, thereby enhancing the supporting effect of the adjusting mandrel on the galvanized steel coil;

[0021] The lifting device is controlled to lift the galvanized steel coil to a proper height, the distance between the rollers of the anti-loosening assembly is adjusted, and the rollers are tightly attached to the outer wall of the galvanized steel coil by the pressurizing device.

[0022] One end of the galvanized steel coil is passed through the extrusion mechanism, and the extrusion mechanism drives the galvanized steel coil and the adjusting mandrel to rotate to complete the uncoiling operation of the galvanized steel coil.

[0023] The beneficial effects of the present application are:

[0024] The support structure in the present application is provided with an abutting plate, and the abutting plate is provided with a buffer layer. The air between the buffer layer and the inner wall of the galvanized steel coil is sucked out by the vacuum pump, so as to fix the galvanized steel coil by the support structure. At the same time, the suction force generated by the negative pressure can prevent the inner ring of the galvanized steel coil from loosening, and the fixing of the galvanized steel coil by the suction force generated by the negative pressure will not cause wear to the galvanized steel coil, thereby avoiding damage to the galvanized steel coil during uncoiling.

[0025] The abutting plate and the center shaft are connected through the cylinder, and the staff can adjust the distance between the abutting plate and the center shaft through the cylinder, so as to conveniently support and fix the galvanized steel coil with different inner diameters by the support structure.

[0026] The present application is provided with an anti-loosening assembly to limit the outer ring of the galvanized steel coil, so as to prevent the galvanized steel coil from becoming loose with the increase of the uncoiling amount during uncoiling. Specifically, the surface of the roller is in contact with the outer ring of the galvanized steel coil by the pressurizing mechanism, so as to limit the outer ring of the galvanized steel coil.

[0027] The lifting device is arranged below the base, and the height of the base and the supporting structure can be adjusted according to different types and sizes of galvanized steel coils, so that the applicability of the device is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0028] FIG. Figure 1 is a schematic view of the present patent;

[0029] FIG. Figure 2 is a structural schematic view of part of the structure of the present patent;

[0030] FIG. Figure 3 is Figure 2 is an enlarged schematic view of position A in FIG.

[0031] FIG. Figure 4 is one of the schematic views of part of the structure of the present patent;

[0032] FIG. Figure 5 is Figure 4 is an enlarged schematic view of position B in FIG.

[0033] FIG. Figure 6 is a schematic view of the cleaning device of the present patent;

[0034] FIG. Figure 7 is the second schematic view of part of the structure of the present patent;

[0035] FIG. Figure 8 is the third schematic view of part of the structure of the present patent.

[0036] In the drawings: 100 - base, 101 - groove, 102 - screw rod, 110 - lifting device, 200 - roller, 210 - guide block, 211 - sliding groove, 220 - pressing structure, 230 - limiting plate, 231 - moving groove, 240 - square block, 300 - base, 301 - protruding block, 310 - adjusting mandrel, 311 - abutting plate, 3111 - cavity, 312 - central shaft, 3121 - air hole, 313 - air cylinder, 314 - bellows, 315 - air pipe, 316 - vacuum pump, 317 - buffer layer, 318 - air exchange hole, 320 - first driving motor, 400 - bracket, 401 - adjusting groove, 410 - upper flattening roller, 420 - lower flattening roller, 500 - square housing, 501 - liquid adding hole, 510 - sponge pad, 520 - liquid storage tank, 521 - liquid outlet pipe. DETAILED DESCRIPTION

[0037] The specific embodiments of the present patent will be described in detail below with reference to the drawings in the embodiments of the present patent:

[0038] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the patent embodiment of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indications will also change accordingly.

[0039] In addition, the descriptions involving "first", "second" and the like in the patent of the present application are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly including at least one of the features.

[0040] In the patent of the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the patent of the present application can be understood according to the specific circumstances.

[0041] Embodiment one

[0042] As shown in Figure 1 , Figure 2 , Figure 3 A uncoiling device for a galvanized steel coil, comprising a base 100, a support structure, a anti-loose assembly and an extrusion mechanism, the support structure is arranged on the base 100, the support structure is in sliding fit with the base 100, the support structure is used for fixing the galvanized steel coil, the anti-loose assembly is connected with the support structure, the anti-loose assembly is used for limiting the galvanized steel coil to prevent the galvanized steel coil from becoming loose with the increase of the uncoiling amount, the extrusion mechanism is arranged on one side of the support structure, the extrusion mechanism is used for flattening the galvanized steel coil, a lifting device 110 is arranged below the base 100, and a movable end of the lifting device 110 is connected with the base 100.

[0043] As shown in Figure 7 , Figure 8 The anti-loose assembly comprises a roller 200, a guide block 210 and a pressing structure 220, a sliding groove 211 is arranged on the guide block 210, an end of the roller 200 is provided with a square block 240, the square block 240 is in sliding fit with the sliding groove 211, the roller 200 is rotationally connected with the square block 240, the pressing structure 220 is arranged in the guide block 210, and the pressing structure 220 is used for adjusting the extrusion force of the roller 200 when limiting the galvanized steel coil; the support structure comprises a base 300, an adjusting mandrel 310 and a first driving motor 320, the adjusting mandrel 310 is rotationally connected with the base 300, and the first driving motor 320 is used for driving the adjusting mandrel 310 to rotate.

[0044] AsFigure 4 , Figure 5 As shown, the adjusting spindle 310 includes an abutment plate 311, a central shaft 312, a cylinder 313, a bellows 314, an air pipe 315, and a vacuum pump 316. The cylinder 313 is mounted on the central shaft 312, and its movable end is connected to the abutment plate 311. A vent hole 3121 is provided on the central shaft 312. One end of the air pipe 315 is connected to the vacuum pump 316, and the other end of the air pipe 315 is rotatably connected to the vent hole 3121. A cavity 3111 is provided inside the abutment plate 311. The bellows 314 connects the cavity 3111 to the vent hole 3121. A buffer layer 317 is provided on the abutment plate 311. An air exchange hole 318 is provided on the abutment plate 311, which connects the cavity 3111 to the outside.

[0045] like Figure 7 As shown, the adjusting spindle 310 and the base 300 are rotatably connected via bearings. The base 300 is connected to the outer ring of the bearing, and the adjusting spindle 310 is connected to the inner ring of the bearing. The pressurizing structure 220 can use a pressure spring. The buffer layer 317 can be made of rubber. A rotary joint is provided on the air pipe 315, which is rotatably connected to the vent 3121 via the rotary joint. The rotary joint can be a rotary screw joint.

[0046] The supporting structure slides with the base 100. Specifically, the base 300 slides with the base 100. A protrusion 301 is provided on the base 300, and a groove 101 is provided on the base 100. The protrusion 301 and the groove 101 slide with each other. A screw 102 is rotatably connected to the groove 101. The screw 102 and the groove 101 are rotatably connected via a bearing. The groove 101 is connected to the outer ring of the bearing, and the screw 102 is connected to the inner ring of the bearing. The protrusion 301 has a through hole with an internal thread. The protrusion 301 and the screw 102 are threaded together. Operators can adjust the position of the supporting structure on the base 100 by rotating the screw 102. The roller 200 is rotatably connected to the block via a bearing. The roller 200 is connected to the inner ring of the bearing, and the block is connected to the outer ring of the bearing.

[0047] In use, the distance between the rollers 200 on the anti-loosening assembly is first adjusted to the maximum to prevent the rollers 200 from interfering with the placement of the galvanized steel coil. Then, the worker manually moves the galvanized steel coil to the front of the support structure. Next, the support structure and the adjusting mandrel 310 are adjusted so that the buffer layer 317 on the abutment plate 311 contacts the inner wall of the galvanized steel coil. Then, the vacuum pump 316 is started to expel the air between the buffer layer 317 and the inner wall of the galvanized steel coil through the ventilation hole 318, cavity 3111, corrugated pipe 314, vent hole 3121, and air pipe 315, so that the buffer layer 317 is in close contact with the inner wall of the galvanized steel coil, thereby fixing the galvanized steel coil with the support structure.

[0048] Then, the operator adjusts the height of the base 100 and the galvanized steel coil by controlling the lifting device 110. The lifting device 110 can be a hydraulic cylinder, a hydraulic jack, or a combination of both. The adjustment continues until the lowest point of the galvanized steel coil is on the same horizontal plane as the midpoint of the extrusion mechanism. Next, the pressure structure 220 brings the surface of the roller 200 into contact with the outer ring of the galvanized steel coil, thus securing the anti-loosening components to the coil. The operator then passes one end of the galvanized steel coil through the extrusion mechanism, which flattens the coil until the uncoiling operation is complete.

[0049] Example 2

[0050] like Figure 1 As shown, in this embodiment, the extrusion mechanism includes a bracket 400, an upper pressure roller 410, and a lower pressure roller 420. An adjustment groove 401 is provided on the bracket 400. The end of the upper pressure roller 410 and the end of the lower pressure roller 420 are slidably engaged with the adjustment groove 401. During the uncoiling operation, the operator can adjust the distance between the upper pressure roller 410 and the lower pressure roller 420 according to the thickness of the galvanized steel coil (according to ASTM A653 / A653M standards, the common thickness range of galvanized steel coils is 0.018-0.035 inches (0.46-0.89 mm), the thickness of thin galvanized steel coils is typically between 0.005-0.020 inches (0.13-0.5 mm), and the thickness of thick galvanized steel coils can reach 0.040 inches (1.02 mm) or more). This ensures that the galvanized steel coil becomes flat after passing through the extrusion mechanism.

[0051] A second drive motor is installed on the upper pressure roller 410. The second drive motor is used to drive the upper pressure roller 410 to rotate. The rotation of the upper pressure roller 410 drives the galvanized steel coil in the extrusion mechanism to move forward continuously, thereby completing the uncoiling operation.

[0052] Example 3

[0053] like Figure 1 As shown, in this embodiment, the upper pressure roller 410 and the lower pressure roller 420 are provided with anti-slip layers. Figure 1 (The black coating portion) The anti-slip layer can be made of rubber. This rubber anti-slip layer prevents the galvanized steel coil from slipping as it passes through the extrusion mechanism, thus accelerating the uncoiling process and improving both efficiency and quality.

[0054] Example 4

[0055] like Figure 1 , Figure 6As shown, in this embodiment, a cleaning device is provided on one side of the extrusion mechanism. The cleaning device includes a square housing 500 and a sponge pad 510. The sponge pad 510 is disposed inside the square housing 500 and can be extruded and connected to the square housing 500. The sponge pad 510 is used to clean the surface of the galvanized steel coil.

[0056] Example 5

[0057] like Figure 6 As shown, in this embodiment, a liquid storage tank 520 is provided on the square shell 500, a cleaning liquid is provided in the liquid storage tank 520, a liquid outlet pipe 521 is provided on the liquid storage tank 520, a liquid filling hole 501 is provided on the square shell 500, and the liquid outlet pipe 521 is connected to the liquid filling hole 501.

[0058] The cleaning solution can be water or a neutral detergent. The cleaning solution flows from the outlet pipe 521 through the filling hole 501 into the square housing 500, then soaks the sponge pad 510, keeping it constantly moist for easy cleaning of the galvanized steel coil surface. The storage tank 520 can be made of transparent materials, such as transparent glass or acrylic. The transparent tank allows staff to easily observe the remaining cleaning solution level and add it promptly when needed.

[0059] Example 6

[0060] like Figure 1 As shown, in this embodiment, the anti-loosening component is provided with a limiting plate 230, the limiting plate 230 is provided with a moving groove 231, and the roller 200 is provided with a threaded hole. The limiting plate 230 and the roller 200 are connected by bolts, and the bolts pass through the moving groove 231 and are threadedly connected to the threaded hole. The depth of the threaded hole can be selected as 10-15 cm.

[0061] The limiting plate 230 includes a retaining ring and guide plates. At least three guide plates are provided, evenly distributed on the retaining ring. A moving groove 231 is provided on the guide plates. Bolts connected to threaded holes are used to fix the limiting plate 230, but the bolts can still move along the length of the moving groove 231 with the roller. The limiting plate 230 is used to prevent displacement of the galvanized steel coil along the length of the central axis 312 during the uncoiling process, thereby avoiding damage to the galvanized steel coil during uncoiling. This improves uncoiling efficiency and production efficiency.

[0062] Example 7

[0063] In this embodiment, the limiting plate 230 is to come into contact with the galvanized steel coil. In order to reduce the wear caused by the galvanized steel coil coming into contact with the limiting plate 230 during rotation, a smooth coating is provided on the limiting plate 230. The smooth coating may be a polytetrafluoroethylene coating.

[0064] Example 8

[0065] In the embodiment, the roller 200 is provided with a protective layer, which can be made of rubber material. Because the roller 200 directly contacts the galvanized steel coil, and the roller 200 will extrude the galvanized steel coil under the action of the pressing structure 220, in order to prevent the extrusion force from being too large to cause the deformation of the galvanized steel coil, the protective layer made of rubber material is arranged on the roller 200, which can play a buffering role between the roller 200 and the galvanized steel coil, and at the same time, the protective layer can increase the friction between the galvanized steel coil and the roller 200, so as to prevent the outer circle of the galvanized steel coil from relaxing during the uncoiling process.

[0066] Embodiment Nine

[0067] A method for uncoiling a galvanized steel coil, comprising the following steps:

[0068] Firstly, the distance between the rollers 200 of the anti-loose assembly is adjusted to the maximum, and then the staff manually moves the galvanized steel coil to the front of the support structure, and adjusts the center line of the support structure to be in the same horizontal plane as the axis of the galvanized steel coil by controlling the lifting device 110;

[0069] The position of the support structure is adjusted, the buffer layer 317 of the abutting plate 311 is brought into contact with the inner wall of the galvanized steel coil by controlling the air cylinder 313, and then the air between the buffer layer 317 and the inner wall of the galvanized steel coil is sucked out by starting the vacuum pump 316, so that the inner wall of the galvanized steel coil is in close contact with the buffer layer 317, and the supporting effect of the adjusting mandrel 310 on the galvanized steel coil is enhanced;

[0070] The lifting device 110 is controlled to lift the galvanized steel coil to an appropriate height, the distance between the rollers 200 of the anti-loose assembly is adjusted, and the rollers 200 are tightly attached to the outer wall of the galvanized steel coil by the pressing device;

[0071] One end of the galvanized steel coil is passed through the extrusion mechanism, the extrusion mechanism drives the galvanized steel coil and the adjusting mandrel 310 to rotate to complete the uncoiling operation of the galvanized steel coil.

[0072] The appropriate height can be the height when the lowest point of the galvanized steel coil and the midpoint of the line connecting the center of the upper flat roller 410 and the center of the lower flat roller 420 in the extrusion mechanism are in the same horizontal plane, and the purpose is to ensure that the galvanized steel coil between the lowest point of the galvanized steel coil and the extrusion structure is in a horizontal state during uncoiling, and at the same time, as the diameter of the galvanized steel coil decreases, the staff can also control the lifting device 110 to keep the lowest point of the galvanized steel coil always in the same horizontal plane as the midpoint of the line connecting the center of the upper flat roller 410 and the center of the lower flat roller 420.

[0073] The specific embodiments described above further illustrate the technical solutions, the technical problems solved and the beneficial effects of the patent application, and it should be noted that the above description is only for specific embodiments of the patent application and is not intended to limit the patent application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the patent application should be included in the protection scope of the patent application.

Claims

1. An uncoiler for a coil of galvanized steel, characterized in that: The device comprises a base (100), a supporting structure, an anti-loose assembly and an extrusion mechanism, the supporting structure is arranged on the base (100) and is in sliding fit with the base (100), the supporting structure is used for fixing the galvanized steel coil, the anti-loose assembly is connected with the supporting structure, the anti-loose assembly is used for limiting the galvanized steel coil to prevent the galvanized steel coil from becoming loose with the increase of the unfolding amount, the extrusion mechanism is arranged on one side of the supporting structure and is used for flattening the galvanized steel coil, and a lifting device (110) is arranged below the base (100), and the movable end of the lifting device (110) is connected with the base (100); The anti-loose assembly comprises a roller (200), a guide block (210) and a pressing structure (220), the guide block (210) is provided with a sliding groove (211), the end of the roller (200) is provided with a square block (240), the square block (240) is in sliding fit with the sliding groove (211), the roller (200) is rotationally connected with the square block (240), the pressing structure (220) is arranged in the guide block (210), and the pressing structure (220) is used for adjusting the extrusion force of the roller (200) when limiting the galvanized steel coil; a protective layer is arranged on the roller (200); a limiting plate (230) is arranged on the anti-loose assembly, the limiting plate (230) is provided with a moving groove (231), the roller (200) is provided with a threaded hole, the limiting plate (230) is connected with the roller (200) through bolts, the bolts are in threaded connection with the threaded hole through the moving groove (231); and the limiting plate (230) is provided with a smooth coating; The supporting structure comprises a base (300), an adjusting mandrel (310) and a first driving motor (320), the adjusting mandrel (310) is rotationally connected with the base (300), and the first driving motor (320) is used for driving the adjusting mandrel (310) to rotate; The adjusting mandrel (310) comprises an abutting plate (311), a central shaft (312), an air cylinder (313), a bellows (314), an air pipe (315) and a vacuum pump (316), the air cylinder (313) is arranged on the central shaft (312), and the movable end of the air cylinder (313) is connected with the abutting plate (311); the central shaft (312) is provided with an air hole (3121), one end of the air pipe (315) is connected with the vacuum pump (316), and the other end of the air pipe (315) is rotationally connected with the air hole (3121); the abutting plate (311) is provided with a cavity (3111), the bellows (314) connects the cavity (3111) with the air hole (3121), the abutting plate (311) is provided with a buffer layer (317), the abutting plate (311) is provided with an air exchange hole (318), and the air exchange hole (318) connects the cavity (3111) with the outside.

2. An uncoiler for a zinc-coated steel coil as claimed in claim 1, characterized in that: The extrusion mechanism comprises a bracket (400), an upper flattening roller (410) and a lower flattening roller (420), the bracket (400) is provided with an adjusting groove (401), the end of the upper flattening roller (410) is in sliding fit with the adjusting groove (401), and the end of the lower flattening roller (420) is in sliding fit with the adjusting groove (401).

3. An uncoiler for a coil of zinc-coated steel as claimed in claim 2, characterised in that: The upper flattening roller (410) and the lower flattening roller (420) are provided with anti-skid layers.

4. An uncoiler for a zinc-coated steel coil as claimed in claim 1, characterized in that: One side of the extrusion mechanism is provided with a cleaning device, which comprises a square shell (500) and a sponge pad (510), the sponge pad (510) is arranged in the square shell (500), and the sponge pad (510) is used for cleaning the surface of the galvanized steel coil.

5. An uncoiler for a coil of zinc-coated steel as claimed in claim 4, characterised in that: The square shell (500) is provided with a liquid storage tank (520), the liquid storage tank (520) is provided with cleaning liquid, the liquid storage tank (520) is provided with a liquid outlet pipe (521), the square shell (500) is provided with a liquid filling hole (501), and the liquid outlet pipe (521) and the liquid filling hole (501) are in communication.

6. A method for uncoiling a zinc-coated steel coil, characterized in that: The use of the uncoiling device for the galvanized steel coil according to any one of claims 1-5 comprises the following steps: First, adjust the distance between the rollers (200) of the anti-loosening assembly to the maximum, then manually move the galvanized steel coil in front of the support structure, adjust the center line of the support structure to the same horizontal plane as the axis of the galvanized steel coil by controlling the lifting device (110); Adjust the position of the support structure and control the air cylinder (313) to make the buffer layer (317) of the abutting plate (311) contact the inner wall of the galvanized steel coil, then start the vacuum pump (316) to suck out the air between the buffer layer (317) and the inner wall of the galvanized steel coil, so that the inner wall of the galvanized steel coil is in close contact with the buffer layer (317), and the supporting effect of the adjusting mandrel (310) on the galvanized steel coil is enhanced; Control the lifting device (110) to lift the galvanized steel coil to an appropriate height, adjust the distance between the rollers (200) of the anti-loosening assembly, and make the rollers (200) tightly contact the outer wall of the galvanized steel coil through the pressurizing structure; Pass one end of the galvanized steel coil through the extrusion mechanism, and the extrusion mechanism drives the galvanized steel coil and the adjusting mandrel (310) to rotate to complete the uncoiling operation of the galvanized steel coil.

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